Wikipedia
The MPMan music player, manufactured by the South Korean company SaeHan Information Systems, debuted in Asia in March 1998, and was the first mass-produced portable solid state digital audio players.
The internal flash memory could be expanded, but there was no support for external memory. It was delivered with a docking station. To put music into the device, the music first had to be encoded in the mp3 format by an encoder provided by the user, and then transferred via the parallel port to the docking station that connected to the portable player device.
On in Japan the Akihabara "Akiba ~ us" stores in Chūō, Tokyo started selling and models, the prices of which were (circa - today $) and , respectively.
In North America, the South Korean device was first imported for sale by Michael Robertson's in mid-1998. Around the same time, Eiger Labs, Inc. imported and rebranded the player in two models, the Eiger MPMan F10, and Eiger MPMan F20.
The Eiger MPMan F10 was a very basic unit and wasn't user expandable, though owners could upgrade the memory from to by sending the player back to with a cheque for . Measuring at tall by wide by thick and weighing a little over , it was very compact. The US price in 1998 for the F10 model with flash memory was circa ..
The was a similar model that used SmartMedia cards for expansion, and ran on a single AA battery, instead of rechargeable NiMH batteries.